52523b6963
8ffcc826 added support for muxing BlockAdditions with BlockAddID equal to one. The restriction to BlockAddID == 1 probably resulted from a limitation to what was needed; yet over time this led to three occurences of "(side_data_size && additional_id == 1)". This commit changes this by setting side_data_size to 0 if additional_id != 1. It also stops hardcoding 1 for the value of BlockAddID to write; but it still upholds the requirement that it is 1. See below. Despite BlockAddId actually having a default value of 1, it is still written, because until very recently (namely dbc50f8a) our demuxer used a wrong default value of 0. Furthermore, use put_ebml_binary() to write the BlockAdditional element. (The Matroska specifications have evolved and now the BlockAddID 1 is reserved for the codec (as described in the codec's codec mapping), BlockMore elements with BlockAddID > 1 are now of a more codec-independent nature and require a BlockAdditionalMapping in the track's TrackEntry. Given that this muxer does not support writing said BlockAdditionalMapping yet (actually, none have been defined yet), we have to uphold the requirement that BlockAddID == 1.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analysis tool to inspect multimedia content.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to the ffmpeg-devel mailing list using
git format-patch or git send-email. Github pull requests should be
avoided because they are not part of our review process and will be ignored.